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  1. GSM INterview Questions and answers

    Quote Originally Posted by vandanapu47 View Post
    This attachment contains most Frequently asked GSM Interview Questions.
    This attachment might help you.

    1. What are the three services offered by GSM? Explain each of them briefly.
    2. Which uplink/downlink spectrum is allocated to GSM-900?
    3. Which uplink/downlink spectrum is allocated to DCS-1800?
    4. How many carrier frequencies are there in GSM-900/DCS-1800? How much is the separation between the carrier frequencies?
    5. What is Ciphering? Why do we need
    ...
    Tags: gsm Add / Edit Tags
    Categories
    GSM
    Attached Thumbnails Attached Files
  2. LTE-Advanced Tutorial-2

    New MIMO Techniques

    LTE Rel.8 supported up to four layers of MIMO multiplexing for downlink and no MIMO for uplink. LTE-Advanced supports single user MIMO (SU-MIMO) scheme up to eight layers (8x8 MIMO) for downlink and four layers (4x4 MIMO) for uplink. With this technology, it achieves peak spectral efficiency of 30 bit/s/Hz for downlink and 15 bit/sec/Hz for uplink. In other words, single 20MHz bandwidth to achieve up to 600Mbps downlink speed.

    6.JPG ...
    Categories
    LTE
  3. LTE-Advanced Tutorial-1

    LTE Breakthrough to Real 4G

    In the spring of 2009, 3GPP LTE Release 8 (LTE Rel.8) specification was completed, and it has triggered LTE service deployment by leading mobile network operators. LTE Rel.8 has set various target requirements for LTE, designed to achieve higher system performance than HSPA in 3GPP Release 6. It has improved system capacity, cell edge user throughput and lower C/U-plane latency, supported by introduction of new radio interface technologies, such as OFDM, ...
    Categories
    LTE
  4. Enhanced Fast Dormancy Feature in WCDMA

    Overview : Some intelligent UEs on a live network send a Signaling Connection Release Indication (SCRI) message to the RNC after PS data transmission is complete. By sending the SCRI message, intelligent UEs request for a transition to idle mode or the CELL_PCH or URA_PCH state to reduce battery consumption. Upon receiving the SCRI, the RNC can release the signaling connection and put the UE into idle mode, or the RNC can maintain the signaling connection and put the UE to CELL_FACH or CELL_PCH/URA_PCH ...
    Tags: umts, wcdma Add / Edit Tags
    Categories
    WCDMA
  5. Introduction of Relay Nodes in LTE-Advanced

    For efficient heterogeneous network planning, 3GPP LTE-Advanced has introduced concept of Relay Nodes (RNs). The Relay Nodes are low power eNodeBs that provide enhanced coverage and capacity at cell edges. One of the main benefits of relaying is to provide extended LTE coverage in targeted areas at low cost.

    LTE-1.PNG

    The Relay Node is connected to the Donor eNB (DeNB) via radio interface, Un, a modified version of E-UTRAN air interface Uu. Donor ...
    Categories
    LTE
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